Ormio, H. (2015). Two land snail species new to Finland: Macrogastra borealis (O. Boettger, 1878) and Quickella arenaria (Potiez & Michaud, 1835) (Mollusca: Gastropoda). Memoranda Societatis pro Fauna et Flora Fennica, 91. Noudettu osoitteesta https://journal.fi/msff/article/view/53555